Electric alarm-bell.



G. A. HUBER.

ELECTRIC ALARM BELL.

APPLICATION FILED MAY 16. 1912.

Patnted June 1, 1915.

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GUSTAV ADOLPH HUBER, OF NEW YORK, N. Y.

ELECTRIC ALARM-BELL.

Specification of Letters Patent.

Patented June l, 1915.

Application filed May 16, 1912. Serial No. 697,771.

To all whom it may concern Be it known that I, GUSTAV A. HUBER, a

citizen of the United States of America,

and a resident of the borough of Bronx, county and State of New York, have invented certain new and useful Improvements in Electric Alarm-Bells, of which the following is a specification.

The invention relates to electric alarms.

Objects of the invention are to provide a novel device of compact, simple and strong construction, which may be quickly and economically manufactured and assembled, and which is durable and reliable in operation; to provide a novel device which obviates the necessity of separate cores, fiber heads for magnets, covers, housings, etc., all of which are expensive and troublesome; to provide a structure of this kind inwhich the main parts are preferably integral; to provide facilities in connection with such a device for rapid and inexpensive assembling, including the winding of the core; to provide an efiicient armature action in connection with a device of this character; to provide simple and reliable fastening means therefor. These and other objects of invention will in part be obvious and will in part appear hereinafter.

The invention consists in the novel parts, constructions, devices, combinations and improvements, herein shown and described.

The accompanying drawing, referred to herein and forming a part hereof, illustrates one embodiment of the invention, the same serving in connection with the description herein to explain the principles of the invention.

Of the drawings: Figure 1 is a front elevation of an alarm embodying my invention; Fig. 2 is a side elevation looking at Fig. 1 from the right; Fig. 3 is a view corresponding to Fig. 1 with the gong, its support and the hammer omitted; and Fig. 4: is a side elevation looking at Fig. 3 from the right.

Referring to the accompanying drawing, illustrating by way of example one embodiment of the invention, the plates A and A in said embodiment constitute What may be termed the casing or frame and also the magnet heads of the alarm. These plates are arranged substantially parallel and are of magnetizable metal. Intermediate said plates A and Av and arranged perpendicularly thereto is the core A, adapted to receive the winding J. In accordance with one feature of the invention, said core is cast or made integral with a plate A or A, and preferably both plates are employed and are made integral with the core. These parts thus constitute an integral frame and housing and obviate the use of a loose casing, and the assembling and fastening of parts together while performing in addition their usual functions or ofiices as magnetic alarm sounding devices.

The invention, in accordance with one of its features, provides means for easily and effectively windin the core whereby the frame can be readily attached to a lathe chuck, or other suitable instrumentality for winding. As embodied, the plate A is provided with a projection A which may be grasped in a lathe chuck and the wire wound on the core. The back of the projection A is preferably made. flat and may serve as a bearing surface against the wall or structure upon which the alarm is mounted. The embodied form of means for fastening the alarm comprises also an opening E through the center of the core A". A screw passing through this opening will thus hold the entire alarm firmly in position against the wall or other structure.

The binding posts are preferably mounted on the plate A, one of them being electrically insulated therefrom. Referring to the so insulated binding post it may be of suitable or usual construction, and as shown it comprises a screw B, and on the under or back side of plate A, there is a metal washer B for making contact with the Winding wire. Between washer B and plate A is a disk B of rubber, fiber or other suitable insulating material. On the opposite or outer face of plate A is another in sulating disk B and a bushing B of said material extends around the screw B where it passes through plate A. A metal washed B and a binding screw B serve to fasten the circuit wire. The other binding post is similarly constructed except that the parts which insulate it from plate A, such as B and B are omitted.

At least one, and preferably both of the and operate to attract the armature when the core is magnetized. An armature is mounted at the side of the plate or plates adapted to be magnetically attracted thereto and to be retracted therefrom by suitable devices. Such plate .orrplates have preferably a curvilinear periphery substantially concentric with the core A, and an armature C of substantially the same curvilinear form, is resiliently mounted on spring C The spring C has the end C thereof anchored to pin or screw F, which pin or screw is fastened to one or both of plates A and i The gong G is shown held in position on and break action.

A. Spring C is also provided with a bearing at C where the spring is shouldered outwardly and passed within the notches in A and A. The lugs C with the cooperating parts insure the proper action of the armature to prevent sticking, buzzing or interference in polarity. The armature is shown cut away at C to afford proper clearance for the bracket D.

Mounted upon and insulated from plate A is a bracket Di Interposed between bracket D and plate A is a double layer of insulating materials D. A screw D fastens brackets D to plate A, the screw being insulated from plate On the inner face of the insulatingvmaterial D is a plate D beneath which, and in electrical contact there with and with screw D, is the end of the magnet'winding wire.

. The make and break mechanism comprises a screw D threaded into the top or outer bend of the bracket D This screw .is' provided with a non-oxidizing metal point. The nut D serves to lock screw D in adjusted position. The end of spring C rests beneath the point of screw D when the current is off, but is drawn away therefrom when the armature C is magnetically attracted, thus giving the requisite make The winding on the core is indicated by J. This insulated wire runs from the under side of the insulated binding post through opening K in the plate A, is wound about the core, and terminates in electrical connection with bracket D at screw D. When agong is used, the support therefor may be provided by an extension A of plate A.

armA rby screw 7H and nut I. A hammer C is shown carried on a rod C fixed to armature C. When the circuit is closed the current may be regarded as flowing in at insulated binding post, from thence through the winding J through bracket D and screw D spring C and through the plate A to "the other or non-insulated binding post.

The actuation of the armature by the magnetization of plates A and. A, makes the break between spring C and screw D as will be clearly understood. v

In additionto the objects and advantages pointed out, it will be understood that the core and frame plates are formed so that there are no obstructions to the winding of the core, the other parts being readily assembled afterward. Also the core and frame plates are adapted to be easily and cheaply jigged, if desired, to put the necessary openings, etc, therein.

Other objects and advantages will be obvious to those skilled in the art without discussion thereof herein.

It will be understood that changes may be made in the embodied form, within the scope of the accompanying claims without departing from the principles of the invention.

I claim:

1. An electric alarm including in combinationtwo plates one at least being magnetizable, said plates being arranged substantially parallel to each other, a core arranged between and connected to said plates, the plates constituting the magnet heads and constituting also covers for the winding about the core, one of said plates having an extension to one side from the foregoing structure, a plurality of binding posts mounted on said extension, one of said posts being insulated from said plate and another of said posts being electrically connected with said plate, an armature cooperating with the edges of said plates, and electrically connected with said plate carrying the binding posts, a make and break device for said armature including a bracket insulated from said plates, and a wire constituting a winding for said core and connecting from said insulated binding post to said bracket.

2. An electrical alarm including in combination two substantially parallel metal plates, a core uniting said plates, a winding about said core, said plates constituting the magnet heads and constituting also a cover for the winding, an armature, a make and break device, binding posts and circuit connections between said winding, make and break and binding posts.

3. In an electrical alarm two flat metal plates substantially parallel to each other and to a supporting surface, a core extending perpendicularly between said plates, the core spacing apart and holding together the plates, and a projection fixed to and extending outwardly from the plate which plates substantially parallel to each other take a screw to fasten the device to a supand to a supporting surface and constitutport.

ing the back and front of the device, a core I GUSTAV ADOLPH HUBER. extending perpendicularly between said Witnesses:

5 plates, and spacing apart the plates, said DAVID L. WOODALL, Jr.,

plates and core being apertured through to GEORGE HONNBURG.

Eopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

